青海金矿成矿规律及找矿方向

青海金矿可分为破碎蚀变岩型、海相火山岩型、矽卡岩型、叠加型和砂矿型等。矿床形成时代较为连续，最早形成于早古生代，最晚形成于新生代，其中晚古生代和中生代是形成矿床的两个高峰期；晚古生代矿床主要分布在柴北缘，中生代矿床主要分布在东昆仑、西秦岭及北巴颜喀拉一带，岩金矿地理上主要分布在北纬35°以北广大地区。破碎蚀变岩型金矿是青海的主要类型，受构造控制明显，区域性深大断裂及次级构造控制了金矿田、矿床的产出和展布。依据金矿田、矿床及成矿信息划分了19个金矿集区。通过分析矿集区、矿化信息和区域成矿条件，提出了10个金成矿远景区，在此基础上结合区域地质背景、综合信息集成、研究程度等因素，认为苏干湖—锡铁山、赛什克南—叉叉龙洼、祁曼塔格、磁铁山—智玉、同德—同仁等5个金成矿远景区最有前景。这5个金成矿远景区主要分布在青海北部和中部，涉及柴北缘成矿带(Ⅲ-6)、东昆仑成矿带(Ⅲ-8)和西秦岭成矿带(Ⅲ-9)。

Metallogenic Regularity and Prospecting Direction of Gold Deposits in Qinghai,China

The gold deposits in Qinghai can be divided into fractured alteration rock-type, marine volcanic rock-type, skarn-type, overlay-type and sand-type. The forming ages of deposit are continuous, ranging from Early Paleozoic to Cenozoic. The peaks of deposit development appear at Late Paleozoic and Mesozoic. Late Paleozoic deposits are mainly located in the northern margin of Qaidam Basin, and Mesozoic deposits mainly distribute in East Kunlun, West Qinling and North Bayankala. The rock gold deposits mainly distribute to the north of 35°N. The fractured alteration rock-type gold deposits are the main in Qinghai, and are strictly controlled by structures. The output and distribution of gold orefields and deposits are controlled by regional deep fractures and secondary structural units as well. Based on the information of gold orefields, deposits and metallogenic characteristics, there are 19 gold ore-concentrated areas divided. According to the ore-concentrated areas, mineralization information and regional metallogenic conditions, the 10 gold metallogenic prospects were proposed. Considering several factors such as regional geological background, information integration and research level, the 5 gold metallogenic prospects including Suganhu-Xitieshan, Saishikenan-Chachalongwa, Qimantage, Citieshan-Zhiyu and Tongde-Tongren are most promising. The above 5 gold metallogenic prospects mainly distribute in the northern and central Qinghai, and are related to the northern margin of Qaidam mineralization belt (Ⅲ-6), the East Kunlun metallogenic belt (Ⅲ-8) and the West Qinling metallogenic belt (Ⅲ-9).